Remove CONFIG_TRACE support.

It was limited to ARMv5, and didn't work correctly. Moreover, it
made integrating upstream changes difficult, so remove it for now.

Change-Id: I7da7a1e00b241d452c6dff5a318ccfedc5d7a8a4
diff --git a/hw/android/android_mips.c b/hw/android/android_mips.c
index 98a082f..a0a3649 100644
--- a/hw/android/android_mips.c
+++ b/hw/android/android_mips.c
@@ -232,23 +232,12 @@
     goldfish_add_device_no_io(&nand_device);
     nand_dev_init(nand_device.base);
 #endif
-#ifdef CONFIG_TRACE
-    extern const char *trace_filename;
-    /* Init trace device if either tracing, or memory checking is enabled. */
-    if (trace_filename != NULL
+
 #ifdef CONFIG_MEMCHECK
-        || memcheck_enabled
-#endif  // CONFIG_MEMCHECK
-       ) {
+    if (memcheck_enabled) {
         trace_dev_init();
     }
-    if (trace_filename != NULL) {
-        D( "Trace file name is set to %s\n", trace_filename );
-    } else  {
-        D("Trace file name is not set\n");
-    }
-#endif
-
+#endif  // CONFIG_MEMCHECK
     pipe_dev_init();
 
 #if TEST_SWITCH